[Mystery bird] Reddish Egret, Egretta rufescens, photographed at Quintana Neotropical Bird Sanctuary, Brazoria County, Texas. [I will identify this bird for you in 48 hours]
Image: Joseph Kennedy, 15 July 2010 [larger view].
Nikon D200, Kowa 883 telescope with TSN-PZ camera eyepiece 1/1250s f/8.0 at 1000.0mm iso400.
Please name at least one field mark that supports your identification.
This lovely species was nearly exterminated in the US by hunters who killed the birds for their plumes. The population is small and still recovering, albeit very slowly.